You should definitely try Saya de Polka, it's a large countryside style map, it even has some long roads going through mountains, although it's a bit bumpy and some of the roads aren't lined up perfectly it's still a nice map
I'm surprised I still remember this but I first used the Tatra Dakar on desert trails with my brother, simply just exploring and trying to get to "the giant mountains in the distance" said my 7 year old self who had no idea those were just textures.
I found this game 9 years ago when my brother showed me it, I'm not quite sure how he found it though, but it certainly didn't take me long to get addicted to it. I made an account after that which I did lose when the website had be modernized but I made another account and I'm not really...